Directional Drilling is the method of controlling the path of a borehole along a predetermined course to a defined target, utilising guidance and deflection tools. Direct Systems Australia utilises RSS steering tools from the UK to control direction and torque and with the help of the drillers display allows the driller to see the path of a directional cut.

Steering

With the wireline steering system provided by Direct Systems Australia continuous directional cuts have been conducted successfully at depths of up to 2100m, and for cut lengths of up to 65m.
The advantage in Directional Steering is that the high side tool face of the Navi Motor can be precisely know at all times through the cuts and movements on both Inclination and Azimuth can be monitored real time which enables dynamic changes to be administered to the settings. Doglegs can easily be calculated and monitored. Required borehole movements can be made in the borehole which reduces downtime for repeat cuts and missing required targets.

Where is Directional Drilling Used?

  • Oil and Gas Industry
  • Utility and Pipeline Construction
  • Mineral Exploration
  • Accurately placed exploration boreholes provide operational efficiency
  • There is an increasing usage of deep drilling in Mineral Exploration, as near surface exploration targets and mineral deposits are exhausted
  • Method of Borehole Control
  • The trajectory of a borehole can be controlled in various of ways;
Altering the configuration of the bottom hole assembly
  • The use of wedges or whipstocks
  • By using directional mud motors

How Does Directional Drilling Benefit a Project?

  • Less drilling metres are required to intersect a greater number of targets. This can achieve significant cost and time savings.
  • Precise borehole placement ensures accurate ore body definition and quantification.
  • Multiple targets drilled from one drill site assist when geographical and environmental factors restrict the placement of drill sites.
  • Geological targets are intersected when deep boreholes are kept to design.
  • Boreholes intersect target zones at the optimum strike angle.
  • Difficult ground conditions can be isolated and cased off, yet still allowing the intersection of multiple lower targets.

Survey Instrumentation – Why Survey Boreholes?

  • Directional Drilling is reliant on there being a means of determining the borehole location.
  • The control and monitoring of the borehole progress and target intersection is achieved using electronic instrumentation;
  • Surface Read-out Steering Tools
  • Electronic Magnetic Multi-shots
  • Gyroscopic Systems